[U-Boot] [PATCH] fastboot: Add USB cable detect check

[Rob Herring]

Add a check for USB cable attached and only enter fastboot when a cable
is attached.

Signed-off-by: Rob Herring <robh at kernel.org>
---
 common/cmd_fastboot.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/common/cmd_fastboot.c b/common/cmd_fastboot.c
index b72f4f3..346ab80 100644
--- a/common/cmd_fastboot.c
+++ b/common/cmd_fastboot.c
@@ -20,6 +20,12 @@ static int do_fastboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 	if (ret)
 		return ret;
 
+	if (!g_dnl_board_usb_cable_connected()) {
+		puts("\rUSB cable not detected.\n" \
+		     "Command exit.\n");
+		return CMD_RET_FAILURE;
+	}
+
 	while (1) {
 		if (g_dnl_detach())
 			break;
-- 
2.1.0